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Flow chart to identify a 2 cylinder crankshaft. Click on the flow chart and table for larger images, click <- arrow in your browser to return to this page.                                                            

The R69 flywheel differs from the other / 2 flywheels because of the position of the ignition marks:

In the course of 1951, BMW changed the format of the engine number and the BMW letters cast in the engine case. The upper one is the old format. Note the dots between the BMW letters. The early engine cases had the VIN number stamped in an oval window. Later on the VIN number moved to the area just above the pushrod tubes Photos: Manolis Saravelakis, Greece                                                            

Overview of  BMW motorcycle models produced from 1948 to 1969 (specials not included) Click for larger image: Models & Production Numbers